I started on the 0.6 Saxenda at the end of May but had to stop it as I was going on holiday and it made me so ill - diarrhoea and nausea. I have since restarted at 0.3 and have slowly built up to 0.6 and this time feeling OK. I also stopped another med that I was on which I believe caused the reaction. My question is that I am now coming up to the 30 day mark and I still have half a pen left. The liquid is clear and looks the same as my other unused pen. Has anyone else used an "old" pen?